Krzystof Kozminski's Aroid Pages - Illustrated page with some personal observations, presented on the International Aroid Society web page. (2 photos)
Missouri Botanical Garden - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 9-10) (6 photos). Also a page for 'Raven'.